refactor: hard-fork GSD -> MSD (Make Software Done)

Mechanical rename produced by scripts/msd-rename.cjs: gsd/Gsd/GSD -> msd/Msd/MSD
across contents and paths, upstream package/repo coordinates -> @golem15/msd-core
and golem15com/msd-core. Deep links into upstream history, sibling upstream
packages, the GSD-2 import feature, CHANGELOG.md and .changeset/ are kept as-is.

Hand edits on top: MSD block-letter banner and logos, LICENSE copyright line,
package/plugin identity, regenerated lockfile, install-tree fixtures, derived
registries and benchmark baseline; migration checksum baseline re-locked
(MSD keeps its own install state, so no install had applied the old sums);
sort-order and regex-escaped expectations in tests adjusted.

src/schema-detect.cts

@@ -178,7 +178,7 @@ export function checkSchemaDrift(
     'Required push commands:',
     pushCommands,
     '',
-    'Run the appropriate push command, or set GSD_SKIP_SCHEMA_CHECK=true to bypass this gate.',
+    'Run the appropriate push command, or set MSD_SKIP_SCHEMA_CHECK=true to bypass this gate.',
   ].join('\n');
   if (skipCheck) {
     return {
@@ -188,7 +188,7 @@ export function checkSchemaDrift(
       schemaFiles: detection.matches,
       orms: detection.orms,
       unpushedOrms,
-      message: 'Schema drift detected but check was skipped (GSD_SKIP_SCHEMA_CHECK=true).',
+      message: 'Schema drift detected but check was skipped (MSD_SKIP_SCHEMA_CHECK=true).',
     };
   }
   return {